Federal Employee Investment Priority Order: How to Stack Your Savings Beyond TSP (2026)

Generic personal finance advice — "max your 401k, then Roth IRA" — is a reasonable default for private-sector workers. But it doesn't account for the FERS pension, the TSP's structural cost advantage, the FEHB/HSA interaction, or the early-retirement Roth conversion window unique to federal employees. This guide gives you the order that actually fits your situation, with 2026 limits and a full GS-14 example.

Why the standard advice doesn't fit

Standard "max your 401k" guidance assumes your retirement account is your only significant retirement income source. Federal employees have a different baseline:

• FERS pension as a guaranteed floor. Your annuity (1%–1.1% × high-3 × years of service) provides steady income regardless of market performance. This changes your portfolio risk tolerance — your investment accounts can afford to hold more equity because the pension replaces what bonds would otherwise cover for income stability.
• TSP expense ratios are unmatched. TSP core funds charge 0.034%–0.039% annually — lower than Vanguard index funds and 10–30× cheaper than most retail mutual funds.¹ Given that cost advantage, maxing TSP before shifting to an IRA has a structural edge. A $300,000 TSP balance at 0.034% vs. 0.10% saves ~$200/year — compounded over decades, it's material.
• The early-retirement Roth conversion window. FERS employees who retire at their MRA (age 55–57) before Social Security begins often have 5–10 years of relatively low taxable income — an ideal window for converting traditional TSP/IRA balances to Roth at lower bracket rates. This changes how you should be accumulating now.
• FEHB and the HSA opportunity. Federal employees enrolled in an FEHB HDHP can open an HSA. Unlike private-sector HSAs that compete with 401k choices, the federal employee's FERS pension provides the income floor — so the HSA can be invested 100% in equities, running as a stealth retirement account with a triple tax benefit unavailable to non-FEHB workers.

Step 1 — Capture 100% of the TSP agency match (5% of salary)

Nothing else in this priority order delivers a guaranteed same-day return. FERS employees who contribute at least 5% of base pay receive the maximum agency contribution: 1% automatic + 3% dollar-for-dollar match + 1% at 50-cents-on-the-dollar match = 5% total from the agency. On every dollar up to your 3% match threshold, the government effectively doubles your contribution before any investment return occurs.²

On a GS-13 Step 5 salary of $115,000 (DC locality), contributing 5% costs you $5,750/year — and the agency adds another $5,750. That's $11,500 invested before you consider market returns. Never leave this on the table.

Step 2 — FSAFEDS flexible spending accounts (if you have qualifying expenses)

FSAFEDS appears before maxing TSP because FSA contributions reduce the income subject to FICA payroll taxes — TSP traditional contributions defer income tax but do not reduce Social Security or Medicare withholding. FSAFEDS also comes before an HSA for employees not in an HDHP.³

2026 FSAFEDS limits:

• Health Care FSA (HCFSA): $3,400. Pre-tax medical, dental, and vision. Available if you are NOT in an FEHB HDHP (HDHP enrollees use an HSA instead, or a LEX HCFSA).
• Dependent Care FSA (DCFSA): $7,500. Pre-tax childcare, after-school programs, adult day care. Raised from $5,000 by OBBBA (effective 2026).
• Limited Expense HCFSA (LEX HCFSA): $3,400. Dental and vision only. Compatible with an HDHP-paired HSA — one of the few ways to hold both simultaneously.

At a 24% federal bracket with Social Security at 6.2%, the combined payroll + income tax savings on $10,900 of FSAFEDS contributions (HCFSA + DCFSA) approach $3,300/year. The critical caveat: HCFSA has a use-it-or-lose-it rule (up to $660 rollover for 2026). Only elect what you'll actually spend on qualifying expenses.

Step 3 — HSA if enrolled in an FEHB HDHP (the triple tax account)

The Health Savings Account is the only account available to federal employees with a genuine triple tax benefit: contributions are pre-tax, growth is tax-free, and qualified withdrawals are tax-free. No other account in this hierarchy matches that structure.⁴

2026 HSA contribution limits:

• Self-only FEHB coverage: $4,400
• Self+1 or self+family coverage: $8,750
• Age 55+ catch-up: +$1,000 (not subject to the SECURE 2.0 super catch-up rules that apply to TSP)

The FERS pension gives HSA investors a structural advantage not available in the private sector: because your pension covers the income floor, your HSA investment account can hold 100% equities for decades. A $8,750/year family HSA contribution invested in a total stock market index fund at 7% annualized return grows to approximately $200,000 tax-free over 15 years — available for Medicare Part B and D premiums, long-term care, and any medical expense in retirement.

Step 4 — Max TSP contributions

After capturing the match and funding tax-advantaged spending accounts, maximize TSP contributions. The TSP's expense ratios (0.034%–0.039%) are lower than any comparable index fund available in an IRA at Fidelity, Vanguard, or Schwab. Every dollar held in TSP vs. a more expensive IRA fund earns a compounding advantage.¹⁵

Roth TSP or traditional TSP? As a general rule: the higher your income bracket now versus your expected retirement bracket, the more valuable the traditional TSP (pre-tax). A GS-14 in a high-locality area at 28% marginal rate who expects retirement income to be taxed at 22% benefits from deferring. An early-career GS-9 at 22% who expects their income to grow substantially may be better served by Roth TSP. For most employees in the 10–12 years before retirement with significant prior service, traditional TSP is the default — but review this with a federal-benefits advisor, particularly if you're planning an aggressive Roth conversion in the early-retirement window. See our FERS Roth conversion guide.

Step 5 — Roth IRA or backdoor Roth ($7,500–$8,600 per person in 2026)

After maxing TSP, a Roth IRA adds benefits the TSP can't provide: a broader investment universe, no required minimum distributions in your lifetime, and withdrawable contribution basis at any age without penalty.⁵

2026 Roth IRA income phase-out ranges:

• Single / head of household: $153,000–$168,000 MAGI (full at <$153K, zero at >$168K)
• Married filing jointly: $242,000–$252,000 MAGI (full at <$242K, zero at >$252K)

GS-14 and above in major locality areas — and virtually all SES members — exceed the single-filer limit. A married GS-14/GS-15 household often exceeds the joint limit as well. For these employees, the backdoor Roth is the path:

1. Contribute $7,500 (or $8,600 if age 50+) to a traditional IRA as a non-deductible contribution.
2. Convert the traditional IRA to a Roth IRA within a few days (before earnings accumulate).
3. File IRS Form 8606 to document the after-tax basis.

The TSP pro-rata advantage: The backdoor Roth gets complicated if you have pre-tax money in any traditional, SEP, or SIMPLE IRA — the IRS aggregates all IRA balances when calculating the taxable fraction of your conversion. Federal employees can eliminate this problem by rolling pre-tax IRA balances into the TSP using Form TSP-60. Most private-sector 401k plans don't accept incoming IRA rollovers. TSP does — giving federal employees a cleaner path to a tax-free backdoor Roth than most private-sector workers have available.

See our full IRA strategy guide for the complete mechanics, four-step TSP pro-rata sequence, and spousal IRA rules.

Step 6 — Taxable brokerage account (with asset location)

Once tax-advantaged accounts are maximized, a taxable brokerage account is the next destination. The key insight for federal employees is asset location — which types of investments to hold in which account types:

• Hold fixed income (bonds) inside TSP. The G Fund and F Fund generate interest income, which is taxed as ordinary income. Inside TSP, that tax is deferred until withdrawal. Holding these in a taxable account would create annual taxable interest events.
• Hold equities in taxable brokerage. Long-term capital gains are taxed at 0%, 15%, or 20% — far lower than ordinary income rates. Total market or S&P 500 index funds in taxable produce minimal annual distributions (low turnover), letting you accumulate gains and control when you realize them.

The early-retirement 0% capital gains window. Long-term capital gains are taxed at 0% up to $49,450 of taxable income for single filers and $98,900 for married filing jointly in 2026.⁶ A FERS employee who retires at MRA (age 56) before Social Security begins — receiving pension income of $55,000, standard deduction $16,100 — has taxable income of $38,900, well below the 0% threshold. They can sell appreciated positions from a taxable brokerage account and pay zero federal capital gains tax. This window closes once Social Security begins and TSP withdrawals start stacking income above the threshold.

For taxable accounts, prefer ETFs over mutual funds — ETFs are more tax-efficient because most buy/sell activity happens between investors on the exchange rather than triggering internal fund redemptions that generate capital gains distributions. A Vanguard or iShares total-market ETF is a natural fit alongside the TSP's C and S funds.

Step 7 — I Bonds ($10,000 per person per year)

Series I savings bonds from TreasuryDirect offer inflation-indexed returns with a favorable tax structure: interest is exempt from state and local income tax and can be deferred until redemption (up to 30 years).⁷

2026 I Bond rates (May–October 2026):⁷

• Fixed rate: 0.90% (locked for the life of the bond)
• Composite rate: 4.26% (fixed 0.90% + inflation component of 1.67% × 2)

Annual purchase limits: $10,000 per person (electronic, via TreasuryDirect.gov) plus up to $5,000 in paper bonds via IRS tax refund. A married couple can purchase $20,000/year in electronic I Bonds.

I Bonds vs. G Fund: The G Fund yielded approximately 4.44% over the trailing 12 months and is fully liquid within TSP. I Bonds have a 1-year lockup and a 3-month interest penalty if redeemed before 5 years. The I Bond advantages: the 0.90% fixed rate is locked forever (you keep it through all future rate resets), and the inflation linkage means the composite rate rises automatically with CPI — making I Bonds a better inflation hedge in periods of sustained high inflation. The G Fund yields more right now but has no inflation linkage guarantee.

Best federal employee use case: I Bonds work well as a dedicated emergency fund for the early-retirement transition. OPM interim pay starts at 60–80% of your final salary; your first year of retirement can have unpredictable cash flow as payments finalize. A federal couple with $30,000–$60,000 in I Bonds (3–6 years of contributions) has liquid, inflation-protected reserves accessible at the 12-month mark — avoiding forced TSP withdrawals at inopportune market timing in year one of retirement.

Step 8 — 529 college savings (if applicable)

If you have children or grandchildren, a 529 plan is the most tax-efficient college savings vehicle. Federal 529 contributions are not deductible on federal income taxes, but growth and qualified withdrawals are entirely federal-tax-free. Most states offer a state income tax deduction or credit for contributions — Virginia's 529 plan (Virginia529) allows an unlimited deduction against Virginia income for contributions.⁸

SECURE 2.0 §529(c)(3)(E) — 529-to-Roth IRA rollover (effective 2024): Up to $35,000 lifetime per beneficiary can be rolled from a 529 to the beneficiary's Roth IRA, subject to:

• The 529 account must have been open at least 15 years
• Annual rollover cannot exceed the Roth IRA contribution limit ($7,500 in 2026)
• Contributions and earnings from the past 5 years cannot be rolled
• The beneficiary must have earned income equal to or exceeding the rollover amount in that year

This provision significantly reduces the "overfunding risk" that made federal employees cautious about 529s. If your child earns $50,000 at age 25 but the 529 has $40,000 in it, up to $35,000 can migrate to their Roth IRA over 5 years — a meaningful head start on their own retirement.

Adjustments as retirement approaches (within 5–8 years)

The accumulation order above shifts as you near retirement. Three federal-employee-specific considerations matter most:

1. Accelerate Roth conversions in the pre-retirement window. The gap between your MRA retirement and Social Security at 62–67 is when income is lowest. Converting traditional TSP/IRA balances to Roth now (paying tax at today's bracket) is often better than paying tax at a higher rate once SS, TSP RMDs, and the pension stack. See our FERS Roth conversion guide for the GS-14 10-year model.
2. Shift TSP toward G Fund / F Fund as the withdrawal date nears. Sequence-of-returns risk — a major market drop in year 1–3 of retirement forcing you to sell equities at a loss — is the biggest portfolio threat in early retirement. The G Fund's principal guarantee (with ~4.4% yield in 2026) makes it an excellent de-risking destination for the portion of TSP you expect to withdraw in the first 5 years.
3. Plan taxable income for IRMAA management. Your Medicare Part B IRMAA surcharge in year X is based on your income in year X−2. Large Roth conversions, TSP withdrawals, or capital gains harvests in the wrong year can trigger IRMAA surcharges on top of standard Part B premiums. Use our Medicare Part B calculator to model the cliff thresholds before executing large conversions.

GS-14 full worked example — age 48, DC locality, married with two children

Common mistakes to avoid

• Stopping at the match and going to IRA instead of maxing TSP. TSP's expense ratios give every dollar inside TSP a cost advantage over a comparable mutual fund in an IRA. For most employees, TSP should be maxed before opening a brokerage account.
• Confusing Roth TSP with Roth IRA. Roth TSP has no income limit — anyone can elect it. Roth IRA direct contributions are income-limited ($168K single / $252K MFJ). These are different accounts with different rules. You can and should use both simultaneously.
• Rolling pre-tax IRA money out of TSP when separating. Many financial advisors reflexively recommend rolling TSP to an IRA at retirement. The G Fund equivalent doesn't exist in any IRA. If you have a pre-tax IRA balance that's currently inside TSP (rolled in to enable the backdoor Roth), rolling it out at retirement recreates the pro-rata problem for future conversions. Think before you roll.
• Ignoring FSAFEDS because "it's complicated." FSAFEDS is one of the clearest tax wins available to federal employees with predictable medical or dependent care expenses. $3,300+ in annual tax savings for a GS-14 family costs nothing but an enrollment election in November.
• Letting the FERS pension make you passive. The pension floor is an asset — but federal employees who assume the pension "covers retirement" and save minimally above TSP match often reach retirement with insufficient flexibility: all their retirement assets are pre-tax (taxable at withdrawal), no Roth bucket for IRMAA management, no taxable brokerage for the 0% capital gains window. Diversifying across account types matters as much as total balance.

Sources

1. TSP.gov — Fund Performance and Expense Ratios: core fund expense ratios 0.034%–0.039% (2025/2026 confirmed). Verified June 2026.
2. TSP.gov — Agency Matching Contributions: 1% automatic + dollar-for-dollar match on first 3% + 50¢/dollar on next 2% = maximum 5% agency contribution when employee contributes 5%.
3. FSAFEDS.gov — 2026 Health Care FSA ($3,400), Dependent Care FSA ($7,500 under OBBBA), and Limited Expense HCFSA ($3,400) contribution limits. Verified June 2026.
4. IRS Publication 969 — Health Savings Accounts and Other Tax-Favored Health Plans: 2026 HSA limits ($4,400 self-only / $8,750 family / +$1,000 age 55+), HDHP qualifying criteria, Medicare Part A enrollment interaction.
5. IRS IR-2025-285 — 2026 retirement plan contribution limits: TSP/401k $24,500 base; catch-up $8,000 (age 50+); super catch-up $11,250 (ages 60–63, SECURE 2.0 §109); IRA limit $7,500; Roth IRA income phase-outs. Verified 2026.
6. Tax Foundation — 2026 Tax Brackets and Federal Income Tax Rates: long-term capital gains 0% rate threshold $49,450 single / $98,900 MFJ taxable income. Verified 2026.
7. TreasuryDirect.gov — I Bonds Interest Rates: composite rate 4.26% (fixed 0.90% + inflation 1.67% semiannual), May–October 2026. $10,000/person annual purchase limit (electronic). Verified May 2026.
8. IRS Topic 313 — Qualified Tuition Programs (Section 529 Plans): federal tax treatment of 529 contributions and withdrawals. SECURE 2.0 §529(c)(3)(E) 529-to-Roth rollover: $35,000 lifetime cap, 15-year account requirement, annual limit equals Roth IRA contribution limit. Verified 2026.

All contribution limits, phase-out thresholds, and rate values verified as of June 2026 against IRS, TSP.gov, TreasuryDirect.gov, and Tax Foundation sources cited above.